Pitch is a key measure of how densely packed the qubits are on the chip surface.
Silicon spin qubits occupy roughly one square micrometre per qubit. For comparison, superconducting qubits typically require around 90,000 square micrometres each, even with optimistic assumptions about future pitch reduction. Neutral atom systems achieve approximately 52 square micrometres per qubit, while trapped ion systems require around 1,600 square micrometres per trap. Silicon’s density advantage is roughly five orders of magnitude over superconducting systems, with direct consequences for how large a processor can be built on a single chip.